tritium

noun

Etymology: Borrowed from New Latin tritium, from Ancient Greek τρίτος (trítos, “third”) + New Latin -ium. By surface analysis, trit- + -ium.

1. A radioactive isotope of the element hydrogen (symbol T, ³H or 31H) having one proton and two neutrons.
2. An atom of this isotope.

   “Electrochemical polymerization of the 1,2-tritiated monomer produced a polymer in which all of the tritiums were eliminated except for those located at the ends of the chains”